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The chain spy can be installed in minutes and is easily adjusted over a 1x chainring. The shims are robust and the arm linking the chain spy to the collar does not flex. This would fit over any size chainring I could add but other seatpost tubes may differ.

Works well, just carry a allen wrench because it can come loose every now and then. I have an E-bike that goes 44mph and this really helps keep the chain from coming off while riding. It has a single 52 thooth chainring. It has made the bike safer.

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Get free shipping with your $50 purchase today when you choose Standard Shipping at checkout. Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items

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